Upgrading desgination based on Jesse's comment.

changelog.html

@@ -78,7 +78,7 @@ Upcoming changes</a>
   <li class=rfe>
     Add log handling line beginning with 'file://' as URL.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-19866">issue 19866</a>)
-  <li class=bug>
+  <li class='major bug'>
     Builds of a concurrently executable job might end up colliding on the same workspace.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-10615">issue 10615</a>)
   <li class=bug>